Centrifugal pump and turbine.



PATENTBD MAAY 19, 190s.

1 E. S. G. REBS'. GENTRIPUGAL PUMP AND TURBINE.l APPLIGATION FILED Nov. 22, 1907.

Y PATBNTED MAY 19, 1908.

G. REBS.

GENTRIFUGAL PUMP AND TURBINB.

APPLICATION FILED NOV. 22, 1907.

2 SHEETS-SHEET 2.

4- L Ill@ 0 j 4 Wg i Unia-EE 5 sTATEs PATENT oEErcE.

EDMUND Scor-T eUsTAvE sans, or DUNsEAajoKENgNEAnWOLVERHAMPTON,

' ENGLAND'.l

Nascanna.

Specification of Letters Patent.

CENTRIFUGALv PUMP AND TURBINE.

Patented May 19, 1908*.

' Application led November 22, 1907. Serial No. 403,409.

ful Improvements in and Relating to Centrifugal Pumps and Turbines, of which the folowing is a specification.

This inventionl relates tofmulti-stage cen- Itrifugal pumps andturbines and has for its main objectsto simpliy'the construction of such umps and turbines, and to afford a smoot ilow for the fluid throughout its passage 'from the inlet to the discharge pipe. These objects are attained by using one or more rotors of the kind characterized by a .central fluid pressure reservoir/of large capacity compared withthe tot'al cross section of the peripheralv outlet, such as the im- "peller or rotor described in my pending application of 13 Sept. 1906, S. N o. 334,456-, irl-which the fluidunder pressure in such a reservoirv is discharged throughv a' 'series of 'peripheral nozzles 1 or orices, and by divlding such rotor 'or rotors by a central web into twseparate Huid pressure reservoirs each having a constricted-peripheral 'outlet or' vseries of nozzles discharging into separate sets of expanding 'channels or other suitable chamber or chambers in the cutwater rin -or casin The dividingl web is so formed t at the uid whichenters on the left is discharged from the right hand outlet andthe fluid which enters at the right eye is discharged from the left hand outlet.

The inventionis illustrated in the .accompan gdrawings, in which l.

Fiyunre 1 is al central longitudinal section and Fig. 2 a sectional elevationA looking in the direction of the arrow Ain Fig. l and with `part ofthe end plate removed of an im eller orrotor such as referred to; Fig. 3 is a ongitudinal section, and Fig. 4 a transverse sectional elevation of a multiplefstage pump withl three double impellers; Fig. 5 is a ongrtudinal section of a series of balanced pumps; Figs. 3*", 5, 6 and'7 show diagrammatically the paths referred to below, ofthe fluid through thevarious machines.

' As shown in Fig. 1 the left eyeAand the right eye A of the im eller are connected with the right hand perip eral outlet B and left hand outlet B respectively by interlaced passages U C in the body of the impeller o'r rotor.

With such a construction of rotor, a two stage centrifugal pump or turbine is obtained. by connecting the expanding chantrated has three double impellers with interlaced liuid passages as shown in Figs. 1 and 2 arefmou'nted on the samefshaft Within symmetrically formed cutwater rings a having suitable expanding channels b which rings are held in place around tlie rotor members c by the pump casing d Iwhich is bolted to the end covers d. Annular` grooves e in the inner periphery of the casing `connect the left hand channels?) of each doubleimpcller with a ductj" formed in the stationary separating-ring f between successive impellers 'and `leading to theleft hand eye of each double im eller'.

Ducts e ormed in the casing d connect thel right hand channels b with `ductsfl on the op posite side of the dividing ring f leading to t e right hand eye of the succeeding impeller. 'ln this` case the partition ring j' is made symmetrical about its medial lane, the `two ducts j" f2 curving outward y on each side,

:and the pum Acasing d is a simple cylindrical casting bore to the external diameter ofthe cutwater and artition rings a, and chambered or cored) to connect up t e fluid passages as described.

In Fig. 5 is shown a balanced multi-stage pump or turbine having twol doublerotors mounted on one shaft and connected in series with each other but with the fluid patharranged so as to be symmetrical on the dtwo sides ofthe medial transverse plane, whereby the various ressures which would separately produce en thrust are equilibrated. It will also be noted that the pressures in each of the rotors are also balanced. or approximately so because the sum of the pressuresof the fluid enterin and leaving on one side of the rotor is equa to-the sum of the pressures of the fluid entering Aand leaving on the other side of the rotor'.

The same balancing result may be obtained by the parallel arrangement of a multi-stage' machine yhaving two double rotors whichis illustrated diagrammatically vpunipof; Fig. 3 and inthe series balanced 'the path Within t in FigfG, in 'which two strjeains of iuid 'enter-i l ing the inner edges of the two double rotors and passing twice through their respective rotors are discharged into the cutw'atervpaschine is indicated by the full and broken lines g, q, the full art being that portion of ary parts of the machine. The full lines 7i', 7i,

represent the periphery of the. rotor and the 1 dotted line i i the periphery of the cutwatcr ring; The full line k lic-represents the center line of the shaft; Alternately the inlet niay be connected with the tWo outer eyes and the delivery With the cutwater passagesV correspending with the two inner eyes ofthe rotor. The path of the fluid the multi-stage pump illustratedin Fig.y 5 may be exempliied in the same manner., as shown in Figs. 3P, 5 a, respectively, in which the reference let-I ters have the same significations as in Fig, 6.

In an'alternativ'e arrangement of multiple4 series Vbalanced pump .or turbine illustrated diaurarnmatically :in the saine manner in Fig. .7, the inlet is connected with the outer eyes ofy thel two outside rotors of the series, and the c utWater and partition ring passages are arranged to lead the fluid which enters at the left hand rotor of the series successively into the left hand eyeof each succeeding double rotor, While the iluid which enters at the right i hand rotor is led successively into the right eye of each rotor of the series. 1 In this casel A,the cutwater ring or casing passages are also crossed or interlaced as shown at j, j, but the path of each stream ofiiuid has a simple,`

Wave shape with no loops.A ,It will be obvious, however, that -the interconnections of therotors in a multi-stage 4centrifugal pump- -or turbine suchas described may be varied in -a number of Ways, thereby involving con-V structional modifications in the cutwater and .partition rings and casing,'and the present invention 1s not restrictedtothe articular :constructions of these parts herein efore de* scribedf the essentialfeature ofV the invention 'being the double in ternzlilv ressure reservoir. having luid passageswhi icross each other within-thebedyjofgthenotor. .i

Having; thus :described theY nature of tlus .invention rand the best ineanszI knowoi" carrying the satin into practicalelect, I claiii1:-

1. 'In' multi-stage centrifugal. pumps and turbines, arotorcoinprisiiig two Iluid 'prc s sure reservoirs separated by a -centralparti-v tion having luid passages which cross .each other within the body of the rotor to connect the. left' hand reservoirwith the right hand i ie rotor 'and the broken-l part that portion of the path in the station- 'inlet r eye, and the right hand reservoir with the' left hand inlet, and ineans for leading the fluid from the delivery side of one reservoir to the inlet'or eye of the other reservoir.

2. In multi-stave centrifugal 4pumps and turbines, a rotor iaving two) ilu-1d pressure reservoirs separated by a' central partition, Huid passages in said partition which cross each other within the body of the rotor and connect the left hand reservoir with the right hand eye or inlet and the right hand reservoir 'with the left hand inlet, a cutwate'rring having duplicate sets of expanding channels into which the two reservoirs respectively discharge, a artition ring between 'successiverotors having ducts on each side of the dividtiiig partition, and a casing chambere'd or cored to connect the two sets of cutwater ducts respectively with lthe two partition ring ducts, substantially as described.

3. In centrifugal 'pumps Vandeturbines, a

plurality of rotors mounted on onesliaft,V each rotor having c pair of Huid-reservoirs separated by a central partition and acting .as centrifugal pressure accumulators and having fluid passagesl across eachl other within the body of said rotor., and a xedc'asing having lexpanding ducts connecting the dislcharge and ,inlet o enings ofvdiffeient reservoirs'in airs, sai connectionsjbe'ing so arranged tiat endthrust on the'sjhaft is annulled, substantially' as described. A

4. 'In centrifugal'puinpsand turbines, la plurality ofrotors niountedon one shaft, each rotor having a pair of'luid reservoirs separated by a central partitionand acting asv centrifugal pressure accumulators, and a fixed casing having expanding ducts connect- `ing the inlet and discharge openings of different reservoirs, said` connections being arranged to lead the fluid through one reservoir in each of the rotors, substantially, as described. p

. .5. In centrifugal pumps-and' turbines,l a plurality of rotorsinounted on one shaft, each rotorhaving ya lpair of iuid reservoirs separated by .a central .partition and' acting as-cen# trifug'alpressure accumulators, and a fixed casing havingexpanding ducts connecting the inlet and discharge openings of the said reservoirs, said connections being arranged to lead the'iluid through both reservoirs in each Aof the rotors in succession, substantiallyl as described. A v l f In testimonywhereof I have signed my naine to this specication in the, presence of two subscribing Witnesses. i

p 'Emirxn scorivG-isiuvii REBS.

i IoSEPu MILLARD. t 

